Bio120 skin presentation


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  • Your presentation as very informative and creative. I like how you broke down and defined epidermis it showed how you retained the knowledge from the last chapter. I also like the fact you didn't overcrowd your presentation.
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Bio120 skin presentation

  1. 1. SKIN The Great Barrier
  2. 2. ORGAN SYSTEM  Integumentary System Composed of multiple structures:  Skin  Hair  Nails  Sweat Glands  Sebaceous Gland
  3. 3. SKIN STRUCTURE  Skin is composed of three main layers Epidermis – the outermost layer of skin, provides the body with water proofing and a barrier for infection  Dermis – deep portion of skin, contains various glands, nerves and allows for attachment of other anatomy  Subcutaneous layer – innermost layer containing fatty tissue 
  5. 5. EPIDERMIS  Epi- prefix meaning upon, over  Dermat/o - combining form meaning skin
  6. 6. EPIDERMIS  The epidermis is the thin outer membrane layer of the skin  Composed of stratified squamous epithelium  Stratified squamous epithelium are a type of tissue containing flat, scale-like cells that overlap into layers
  7. 7. KERATIN    The deepest layer of the epidermis, known as the basal layer, continually form new cells As cells move to the outside layers, the cells become filled with a hard protein, known as keratin Keratinization of these cells allow the skin to act as an effective barrier to infection and make the skin waterproof
  8. 8. MELANIN  The basal layer also contains melanocytes, which produce the black pigment melanin  Melanin colors the skin and protects against damage from ultraviolet rays of the sun
  9. 9. DERMIS  The dermis, also called the corium, is the middle layer of the skin  It is a much larger layer than the epidermis, and has a very good blood supply
  10. 10. DERMIS  The dermis is composed of connective tissue and collagen fibers  Collagen fibers are made from a strong, fibrous protein present in connective tissue  These fibers form a flexible “glue” that gives the tissues strength
  11. 11. DERMIS  The dermis contains many other accessory pieces to the skin including        Hair follicles Sweat glands Sebaceous glands Blood vessels Lymph vessels Sensory receptors Nerve and muscle fibers
  12. 12. SUBCUTANEOUS LAYER  The deepest layer of the skin is the subcutaneous, also called the hypodermis    Hypo – under, below Cutane/o – skin The subcutaneous layer is composed of fat cells called lipocytes These cells protect deeper tissues and act as insulation for heat and cold
  13. 13. ACCESSORY ORGANS FOUND IN SKIN  Hair – composed of keratin    Hair shaft grows from follicle towards surface Arrector pili muscle contracts to cause “goose bumps” Sebaceous gland – found in dermis, secretes sebum, which lubricates hair and skin
  14. 14. ACCESSORY ORGANS FOUND IN SKIN  Nails – flat plates of keratin that cover ends of fingers and toes    Nail bodies cover the nail, connecting to the nail bed Nails grow longer from the nail root, found at the base of the nail and covered by the soft tissue known as the cuticle Light, half moon area at the base of the nail is called the lunula
  16. 16. ACCESSORY ORGANS FOUND IN SKIN  Sweat glands – also known as sudoriferous glands, are found throughout the body     Around 2 million sweat glands in total Located in the dermis, the sweat travels to the skin surface through a sweat gland The surface opening is called a sweat pore Sweat, or perspiration cools the body as it evaporates
  17. 17. SKIN   Skin is a great barrier providing protection from infectious bacteria, protecting vital organs and regulating your body temperature Fun fact: the skin is the human body’s largest organ